Weil-mclain 381-359-305 CGA-3 Cast Iron Gas Water Boiler 48000 Btu Output Spark Ignition Taco 007e Circulator Series 4 Natural Gas

Product Description

The Weil-McLain 381-359-305 is the CGA-3 Series 4 cast iron gas-fired hydronic water boiler rated at 48000 BTU output, designed for residential and light commercial heating applications. This boiler runs on natural gas and uses spark ignition for reliable, consistent startup. It ships complete with a Taco 007e circulator, making it a ready-to-install solution for licensed HVAC and plumbing professionals. Cast iron construction gives this boiler exceptional durability and long service life, which is why Weil-McLain backs the heat exchanger with a 20-year warranty and covers parts for 2 years. The CGA-3 operates as a power vent boiler, venting through a 4-inch vent connection, which provides flexible installation options where direct chimney access is not available. The unit draws 67000 BTU input and delivers 48000 BTU output, achieving 84% efficiency. The IBR rating of 49000 BTU and a DOE rating of 56000 BTU confirm solid real-world heating performance. This hydronic boiler operates on a standard 120-volt electrical supply and is approved for installations up to 4500 feet above sea level. The gas connection is 1/2 inch and the water connection is 1 inch, both standard sizes that simplify integration with existing residential or light commercial piping systems. A 30 psi pressure relief valve is included for safe system operation. The unit measures 52-3/8 inches tall, 23-1/4 inches deep, and 10 inches wide, fitting into utility rooms and mechanical spaces where vertical clearance is available. Licensed contractors working on forced hot water heating system replacements or new construction installs will find the CGA-3 Series 4 a dependable, well-supported choice backed by one of the most recognized names in hydronic heating.

• 48000 BTU output with 84% efficiency and a 67000 BTU input rating for residential and light commercial hydronic heating
• Cast iron heat exchanger with a 20-year warranty for long-term durability in hot water boiler applications
• Includes Taco 007e circulator and features spark ignition, power vent design, and a 4-inch vent connection for flexible installation

Product Highlights

The Weil-McLain CGA-3 Series 4 delivers proven cast iron reliability for natural gas hydronic heating systems, arriving circulator-equipped and ready for professional installation in residential and light commercial settings.

Product Information

Standard Information

• Brand: WEIL-MCLAIN
• Manufacturer Part Number: 381-359-305

Technical Specifications

• Product Type: Boiler
• Boiler Type: Standard
• System Type: Hydronic (Water)
• Application: Heating
• Fuel Type: Natural Gas
• Ignition Type: Spark Ignition
• Vent Type: Power Vent
• Vent Size: 4 inches
• BTU Input: 67000 BTU
• BTU Output: 48000 BTU
• IBR Rating: 49000 BTU
• DOE Rating: 56000 BTU
• Efficiency: 84%
• Voltage: 120V
• Gas Connection: 1/2 inches
• Water Connection: 1 inches
• Pressure Relief: 30 psi
• Max Altitude: 4500 feet
• Height: 52-3/8 inches
• Depth: 23-1/4 inches
• Width: 10 inches
• Features: Taco 007e Circulator Included
• Warranty: 20 Year (Heat Exchanger) / 2 Year (Parts)